DOWNLOAD ANY SITE SOURCE CODE (FREE/BROWSER EXTENTION)

You can download the complete source code of any page or site And Using this you can make custom phishing pages easy or steal website formats etc.

Link: https://chrome.google.com/webstore/detail/singlefile/mpiodijhokgodhhofbcjdecpffjipkle

How does this work, i get for example for twitch if i download a html file. Is that useful?